|
Message
From: Jeremy Bennett<jeremy.bennett@e...>
Date: Fri Aug 8 20:50:19 CEST 2008
Subject: [openrisc] Hardware watchpoints on the OpenRISC 1000
According to the Architecture Manual, Debug Mode Register 1 implements
two watchpoint chains, each of length 4.
Chain Watchpoints 0-3 connect an external matchpoint with matchpoints
0-3. Chain Watchpoints 4-7 connect an external matchpoint with
matchpoints 4-7.
(There are also two counter watchpoints).
I believe the document is WRONG and there is a single watchpoint chain
of length 7.
My reading of the Verilog (or1200_du.v) leads me to this conclusion. In
addition all the existing software I can find (e.g. the Architectural
Simulator and the old GDB port) has implemented a single chain of length
8.
Can anyone confirm which is correct. I'm in the middle of adding
hardware watchpoints to GDB 6.8. I shall assume a single watchpoint
chain unless I hear otherwise.
Any information much welcomed.
Thanks,
Jeremy
--
Tel: +44 (1202) 416955
Cell: +44 (7970) 676050
SkypeID: jeremybennett
Email: jeremy.bennett@e...
Web: www.embecosm.com
|
 |
Browse
